An organic light emitting display device includes a substrate including a plurality of pixel areas, each of the plurality of pixel areas including a light emitting region and a transmission region, a first electrode disposed on the light emitting region of the substrate, a second electrode opposing the first electrode, an organic light emitting layer which is disposed on the light emitting region of the substrate and disposed between the first electrode and the second electrode, and an auxiliary electrode which is disposed on the transmission region of the substrate and electrically connected to the second electrode.